noun
a disrespectful laugh or chuckle
verb
to laugh in a disrespectful or mocking manner
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She couldn't help but notice the subtle snigger from the back of the room during her presentation.
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I saw him sniggering behind his hand when she tripped on the sidewalk.
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The boys were sniggering at the new kid's awkward attempt at a joke.
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The dark clouds seemed to snigger at the sun's feeble attempt to break through.